Spring hinge



FIG. 1 is a right, top, back perspective view of a spring hinge.

FIG. 2 is a bottom, left, front perspective view of the spring hinge.

FIG. 3 is a right side view of the spring hinge, showing the screw head rotated in the opposite direction.

FIG. 4 is a left side view of the spring hinge.

FIG. 5 is a bottom view of the spring hinge.

FIG. 6 is a top view of the spring hinge.

FIG. 7 is a back side view of the spring hinge.

FIG. 8 is a front side view of the spring hinge; and,

FIG. 9 is a bottom, left, back perspective view of the spring hinge in an articulated, open position. 

CLAIM The ornamental design for a spring hinge, as shown and described. 